CN112679189A - Radiation-proof calcium silicate board and preparation process thereof - Google Patents
Radiation-proof calcium silicate board and preparation process thereof Download PDFInfo
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- CN112679189A CN112679189A CN202011577343.6A CN202011577343A CN112679189A CN 112679189 A CN112679189 A CN 112679189A CN 202011577343 A CN202011577343 A CN 202011577343A CN 112679189 A CN112679189 A CN 112679189A
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- 239000000378 calcium silicate Substances 0.000 title claims abstract description 45
- 229910052918 calcium silicate Inorganic materials 0.000 title claims abstract description 45
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 64
- 239000002131 composite material Substances 0.000 claims abstract description 44
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000011398 Portland cement Substances 0.000 claims abstract description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 9
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 9
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 9
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 9
- 239000010453 quartz Substances 0.000 claims abstract description 9
- 239000010456 wollastonite Substances 0.000 claims abstract description 9
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 36
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 26
- 239000004917 carbon fiber Substances 0.000 claims description 26
- 239000002002 slurry Substances 0.000 claims description 18
- 239000011204 carbon fibre-reinforced silicon carbide Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 229920003257 polycarbosilane Polymers 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002243 precursor Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000012159 carrier gas Substances 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 5
- 239000003085 diluting agent Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 230000008595 infiltration Effects 0.000 claims description 5
- 238000001764 infiltration Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 239000008096 xylene Substances 0.000 claims description 5
- 230000005855 radiation Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
- 239000010425 asbestos Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052895 riebeckite Inorganic materials 0.000 description 3
- 230000004584 weight gain Effects 0.000 description 3
- 235000019786 weight gain Nutrition 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 239000002296 pyrolytic carbon Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a radiation-proof calcium silicate board and a preparation process thereof, wherein the radiation-proof calcium silicate board is prepared from the following raw materials in parts by weight: 25-30 parts of quartz powder, 18-22 parts of diatomite, 13-16 parts of slaked lime, 20-25 parts of Portland cement, 8-10 parts of composite fiber and 4-6 parts of wollastonite. The calcium silicate board has the advantages of cheap and easily-obtained raw materials, simple preparation method, mature production process technology, suitability for industrial large-scale production, low production cost, excellent mechanical property, ideal radiation resistance, great improvement on the application field of the product and good use value.
Description
Technical Field
The invention belongs to the technical field of calcium silicate boards, and particularly relates to a radiation-proof calcium silicate board and a preparation process thereof.
Background
The calcium silicate board is a board made up by using loose short fibre of inorganic mineral fibre or cellulose fibre as reinforcing material and using siliceous-calcareous material as main body cementing material through the processes of pulping, forming and adding high-temp. high-pressure saturated steam to accelerate curing reaction so as to form calcium silicate gel body.
With the continuous development of electronic technology, in the current living and working environment, radiation sources including mobile phones, computers and the like are more and more, natural ultraviolet radiation and the like are also provided, and after long-time radiation is carried out on fibers such as wood pulp fibers, asbestos fibers and the like commonly used in calcium silicate boards, the density of the fibers is increased, which means that the volume of the fibers is seriously shrunk, the fibers and a base body are easily stripped, and the performance of the calcium silicate boards is finally influenced, so that how to improve the radiation protection performance of the calcium silicate boards on the basis of the prior art has an important effect on the performance and the service cycle of the calcium silicate boards.
Disclosure of Invention
The invention aims to make up for the defects of the prior art and provides a radiation-proof calcium silicate board and a preparation process thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the radiation-proof calcium silicate board is prepared from the following raw materials in parts by weight: 25-30 parts of quartz powder, 18-22 parts of diatomite, 13-16 parts of slaked lime, 20-25 parts of Portland cement, 8-10 parts of composite fiber and 4-6 parts of wollastonite.
Preferably, the radiation-proof calcium silicate board is prepared from the following raw materials in parts by weight: 28 parts of quartz powder, 20 parts of diatomite, 15 parts of slaked lime, 22 parts of Portland cement, 9 parts of composite fiber and 5 parts of wollastonite.
Further, the composite fiber is formed by mixing C/C composite fiber and C/SiC composite fiber according to the mass ratio of 1: 3, mixing to obtain the product.
Further, the preparation method of the C/C composite fiber comprises the following steps: and (3) vacuum-maintaining the T300 carbon fiber at 1550-.
Furthermore, in the chemical vapor infiltration treatment process, ethanol and methane are used as mixed precursors, nitrogen is used as carrier gas and diluent gas, the deposition temperature is controlled to be 1100-1150 ℃, and the density of the obtained fiber is 1.70-1.75g/cm3The aperture ratio is 9.92-10.16%.
Further, the preparation method of the C/SiC composite fiber comprises the following steps: and (2) vacuum-maintaining the T300 carbon fiber at 1550-.
Further, the viscosity of the polycarbosilane/xylene solution is controlled to be 55-65 mPa.s, and the density of the obtained fiber is 1.97-1.99g/cm3The aperture ratio is 5.24-5.45%.
The preparation process of the radiation-proof calcium silicate board comprises the following steps:
(1) weighing the raw materials according to the proportion, mixing, and adding water to obtain slurry with the concentration of 20-25%;
(2) injecting the slurry into a mold and pressing to form a plate blank;
(3) feeding the plate blank into a precuring box, and precuring for 5-6 hours at 33-38 ℃ by moisture;
(4) after the pre-curing is finished, the mixture is sent into an autoclave for constant pressure curing for 8 to 10 hours at the temperature of 1.0 to 1.1MPa and 170 ℃ and 180 ℃;
(5) and (3) conveying the plate into a dryer, and drying at the temperature of 100-110 ℃ until the moisture content is not more than 8% to obtain the calcium silicate plate.
The invention has the advantages that:
the calcium silicate board has the advantages of cheap and easily-obtained raw materials, simple preparation method, mature production process technology, suitability for industrial large-scale production and low production cost.
The calcium silicate board is obtained by mixing C/C composite fibers and C/SiC composite fibers on the basis of original materials, wherein the C/C composite fibers are well filled into gaps among the fiber bundles through pyrolytic carbon, the fiber bundles and a matrix are bound to play a role of common bearing, less crack deflection is caused when external stress is applied, the mechanical property is improved, the C/SiC composite fibers are soaked into carbon fiber bundle filaments through polycarbosilane serving as a precursor solution by utilizing lower viscosity of the polycarbosilane, and a continuous silicon carbide matrix can be formed at fiber intersection positions to further improve the mechanical property The high-crystallization characteristic can also keep the self-structure stability under the radiation condition, and the high-crystallization high-performance radiation printing ink has more excellent service performance in a place with more radiation.
The calcium silicate board has excellent mechanical property and ideal radiation resistance, greatly improves the application field of products, and has better use value.
Detailed Description
The technical scheme of the invention is further explained by combining the specific examples as follows:
example 1
The radiation-proof calcium silicate board is prepared from the following raw materials in parts by mass: 28kg of quartz powder, 20kg of diatomite, 15kg of slaked lime, 22kg of Portland cement, 9kg of composite fiber and 5kg of wollastonite.
The composite fiber is prepared from C/C composite fiber and C/SiC composite fiber according to the mass ratio of 1: 3, mixing to obtain the product.
The preparation method of the C/C composite fiber comprises the following steps: vacuum maintaining T300 carbon fiber in a high temperature furnace at 1600 ℃ for 30 minutes to obtain a carbon fiber preform, taking ethanol and methane as a mixed precursor, taking nitrogen as a carrier gas and a diluent gas, controlling the deposition temperature to be 1125 ℃, and treating the preform by a chemical vapor infiltration method to obtain C/C composite fiber with the density of 1.72g/cm3The opening ratio was 9.98%.
The preparation method of the C/SiC composite fiber comprises the following steps: keeping T300 carbon fiber in a high temperature furnace at 1600 ℃ for 30 minutes in vacuum to obtain a carbon fiber preform, preparing polycarbosilane and xylene into a solution with the viscosity of 60 mPas and the mass fraction of 40%, adding SiC micropowder with the mass of 50% of the solution into the solution to form slurry, placing the carbon fiber preform in a vacuum tank, sucking the slurry, adding air to the pressure of 1.0MPa, keeping the pressure for 30 minutes, taking out the carbon fiber preform, drying the carbon fiber preform, heating the carbon fiber preform to 1350 ℃ for cracking, repeating the process until the weight gain rate is reduced to below 2%, and obtaining the C/SiC composite fiber with the density of 1.98g/cm3The open porosity was 5.33%.
The preparation process of the radiation-proof calcium silicate board comprises the following steps:
(1) weighing the raw materials according to the proportion, mixing, and adding water to obtain slurry with the concentration of 22.5%;
(2) injecting the slurry into a mold and pressing to form a plate blank;
(3) feeding the plate blank into a precuring box, and precuring for 5.5 hours at 36 ℃ by moisture;
(4) after the pre-curing is finished, the mixture is sent into an autoclave and is cured for 9 hours under the constant pressure of 1.05MPa and 175 ℃;
(5) and (3) feeding the board into a dryer, and drying at 105 ℃ until the moisture content is not more than 8% to obtain the calcium silicate board.
Example 2
The radiation-proof calcium silicate board is prepared from the following raw materials in parts by mass: 25kg of quartz powder, 18kg of diatomite, 13kg of slaked lime, 20kg of Portland cement, 8kg of composite fiber and 4kg of wollastonite.
The composite fiber is prepared from C/C composite fiber and C/SiC composite fiber according to the mass ratio of 1: 3, mixing to obtain the product.
The preparation method of the C/C composite fiber comprises the following steps: vacuum maintaining T300 carbon fiber in a high temperature furnace at 1550 ℃ for 40 minutes to obtain a carbon fiber preform, taking ethanol and methane as a mixed precursor, taking nitrogen as a carrier gas and a diluent gas, controlling the deposition temperature to be 1100 ℃, and treating the preform by a chemical vapor infiltration method to obtain C/C composite fiber with the density of 1.70g/cm3The open porosity was 10.16%.
The preparation method of the C/SiC composite fiber comprises the following steps: vacuum maintaining T300 carbon fiber in a high temperature furnace at 1550 ℃ for 40 minutes to obtain a carbon fiber preform, preparing polycarbosilane and xylene into a solution with the viscosity of 55 mPa.s and the mass fraction of 40%, adding SiC micropowder with the mass of 50% of the solution into the solution to form slurry, placing the carbon fiber preform in a vacuum tank, sucking the slurry, adding air to the pressure of 1.0MPa, keeping the pressure for 30 minutes, taking out the carbon fiber preform, drying the carbon fiber preform, heating the carbon fiber preform to 1350 ℃ for cracking, repeating the process until the weight gain rate is reduced to below 2%, and obtaining the C/SiC composite fiber with the density of 1.97g/cm3The open porosity was 5.45%.
The preparation process of the radiation-proof calcium silicate board comprises the following steps:
(1) weighing the raw materials according to the proportion, mixing, and adding water to obtain slurry with the concentration of 20%;
(2) injecting the slurry into a mold and pressing to form a plate blank;
(3) feeding the plate blank into a precuring box, and precuring for 6 hours at 33 ℃ by moisture;
(4) after the pre-curing is finished, the mixture is sent into an autoclave and is cured for 8 hours under the constant pressure of 1.0MPa and the temperature of 180 ℃;
(5) and (3) feeding the board into a dryer, and drying at 100 ℃ until the moisture content is not more than 8% to obtain the calcium silicate board.
Example 3
The radiation-proof calcium silicate board is prepared from the following raw materials in parts by mass: 30kg of quartz powder, 22kg of diatomite, 16kg of slaked lime, 25kg of Portland cement, 10kg of composite fiber and 6kg of wollastonite.
The composite fiber is prepared from C/C composite fiber and C/SiC composite fiber according to the mass ratio of 1: 3, mixing to obtain the product.
The preparation method of the C/C composite fiber comprises the following steps: vacuum maintaining T300 carbon fiber in a high temperature furnace at 1650 ℃ for 20 minutes to obtain a carbon fiber preform, taking ethanol and methane as a mixed precursor, taking nitrogen as a carrier gas and a diluent gas, controlling the deposition temperature to 1150 ℃, and treating the preform by a chemical vapor infiltration method to obtain C/C composite fiber with the density of 1.75g/cm3The open cell content was 9.92%.
The preparation method of the C/SiC composite fiber comprises the following steps: maintaining T300 carbon fiber in a high temperature furnace at 1650 ℃ for 20 minutes to obtain a carbon fiber preform, preparing polycarbosilane and xylene into a solution with the viscosity of 65 mPa.s and the mass fraction of 40%, adding SiC micropowder with the mass of 50% of the solution into the solution to form slurry, placing the carbon fiber preform in a vacuum tank, sucking the slurry, adding air to the pressure of 1.0MPa, taking out the solution after maintaining for 30 minutes, drying the solution, heating the solution to 1350 ℃ for cracking, repeating the process until the weight gain rate is reduced to below 2%, and obtaining the C/SiC composite fiber with the density of 1.99g/cm3The open porosity was 5.24%.
The preparation process of the radiation-proof calcium silicate board comprises the following steps:
(1) weighing the raw materials according to the proportion, mixing, and adding water to obtain slurry with the concentration of 25%;
(2) injecting the slurry into a mold and pressing to form a plate blank;
(3) feeding the plate blank into a precuring box, and precuring for 5 hours at 38 ℃ by moisture;
(4) after the pre-curing is finished, the mixture is sent into an autoclave and is cured for 10 hours under the constant pressure of 1.1MPa and the temperature of 170 ℃;
(5) and (3) feeding the board into a dryer, and drying at 110 ℃ until the moisture content is not more than 8% to obtain the calcium silicate board.
Comparative example
Compared with the embodiment 1, the composite fiber in the material is replaced by asbestos fiber, and the concrete steps are as follows:
a calcium silicate board is prepared from the following raw materials in parts by mass: 28kg of quartz powder, 20kg of diatomite, 15kg of slaked lime, 22kg of Portland cement, 9kg of asbestos fiber and 5kg of wollastonite.
A preparation process of the calcium silicate board comprises the following steps:
(1) weighing the raw materials according to the proportion, mixing, and adding water to obtain slurry with the concentration of 22.5%;
(2) injecting the slurry into a mold and pressing to form a plate blank;
(3) feeding the plate blank into a precuring box, and precuring for 5.5 hours at 36 ℃ by moisture;
(4) after the pre-curing is finished, the mixture is sent into an autoclave and is cured for 9 hours under the constant pressure of 1.05MPa and 175 ℃;
(5) and (3) feeding the board into a dryer, and drying at 105 ℃ until the moisture content is not more than 8% to obtain the calcium silicate board.
The performance of the calcium silicate board obtained in the specification of JC/T564.1-2018 fiber reinforced calcium silicate board is detected, and the results are shown in Table 1:
TABLE 1
As can be seen from Table 1, the mechanical properties of the calcium silicate boards obtained in examples 1-3 are significantly better than those of the comparative example, and the density of the fibers is substantially unchanged after irradiation at 800 ℃ and 10dpa, while the density of the comparative example is increased by about 3%, i.e. the irradiation condition causes the shrinkage of the fiber volume, which affects the properties.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The radiation-proof calcium silicate board is characterized by being prepared from the following raw materials in parts by weight: 25-30 parts of quartz powder, 18-22 parts of diatomite, 13-16 parts of slaked lime, 20-25 parts of Portland cement, 8-10 parts of composite fiber and 4-6 parts of wollastonite.
2. The radiation-proof calcium silicate board as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 28 parts of quartz powder, 20 parts of diatomite, 15 parts of slaked lime, 22 parts of Portland cement, 9 parts of composite fiber and 5 parts of wollastonite.
3. The radiation-proof calcium silicate board according to claim 1, wherein the composite fibers are formed by mixing C/C composite fibers and C/SiC composite fibers in a mass ratio of 1: 3, mixing to obtain the product.
4. The radiation-proof calcium silicate board as claimed in claim 3, wherein the preparation method of the C/C composite fiber is as follows: and (3) vacuum-maintaining the T300 carbon fiber at 1550-.
5. The radiation-proof calcium silicate board as claimed in claim 4, wherein during the chemical vapor infiltration treatment, ethanol and methane are used as mixed precursors, nitrogen is used as carrier gas and diluent gas, the deposition temperature is controlled to 1100 ℃ and 1150 ℃, the density of the obtained fiber is 1.70-1.75g/cm3, and the aperture ratio is 9.92-10.16%.
6. The radiation-proof calcium silicate board according to claim 3, wherein the preparation method of the C/SiC composite fiber comprises the following steps: and (2) vacuum-maintaining the T300 carbon fiber at 1550-.
7. The radiation-protective calcium silicate board according to claim 6, wherein the viscosity of the polycarbosilane/xylene solution is controlled to be 55-65 mPa-s, the resulting fiber density is 1.97-1.99g/cm3, and the opening ratio is 5.24-5.45%.
8. The preparation process of the radiation-proof calcium silicate board as claimed in any one of claims 1 to 7, which comprises the following steps:
(1) weighing the raw materials according to the proportion, mixing, and adding water to obtain slurry with the concentration of 20-25%;
(2) injecting the slurry into a mold and pressing to form a plate blank;
(3) feeding the plate blank into a precuring box, and precuring for 5-6 hours at 33-38 ℃ by moisture;
(4) after the pre-curing is finished, the mixture is sent into an autoclave for constant pressure curing for 8 to 10 hours at the temperature of 1.0 to 1.1MPa and 170 ℃ and 180 ℃;
(5) and (3) conveying the plate into a dryer, and drying at the temperature of 100-110 ℃ until the moisture content is not more than 8% to obtain the calcium silicate plate.
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| CN202011577343.6A CN112679189A (en) | 2020-12-28 | 2020-12-28 | Radiation-proof calcium silicate board and preparation process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114516746A (en) * | 2022-03-31 | 2022-05-20 | 黄伟 | Radiation-proof diatom board and preparation method thereof |
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| CN101979355A (en) * | 2010-10-07 | 2011-02-23 | 宜春市金特建材实业有限公司 | Composite fiber calcium silicate board and preparation method thereof |
| CN104591665A (en) * | 2015-01-13 | 2015-05-06 | 南安市国高建材科技有限公司 | Environment-friendly non-asbestos fiber reinforced calcium silicate plate |
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2020
- 2020-12-28 CN CN202011577343.6A patent/CN112679189A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101979355A (en) * | 2010-10-07 | 2011-02-23 | 宜春市金特建材实业有限公司 | Composite fiber calcium silicate board and preparation method thereof |
| CN104591665A (en) * | 2015-01-13 | 2015-05-06 | 南安市国高建材科技有限公司 | Environment-friendly non-asbestos fiber reinforced calcium silicate plate |
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| 励杭泉等: "《材料导论（第二版）》", 30 June 2013, 中国轻工业出版社 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114516746A (en) * | 2022-03-31 | 2022-05-20 | 黄伟 | Radiation-proof diatom board and preparation method thereof |
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